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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac7b431ca603371854c48694c0c714e2154957502fe37b3a8d8f31e83615c0e' 
  AND token = 'xjkmXGoABL2uS6kUFsNU1qID89Dy+JSEias4Ne86kDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}